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2.x: Add Flowable.switchMapCompletable{DelayError} operator (#5870)
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src/main/java/io/reactivex/internal/operators/mixed/FlowableSwitchMapCompletable.java
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| /** | ||
| * Copyright (c) 2016-present, RxJava Contributors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in | ||
| * compliance with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software distributed under the License is | ||
| * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See | ||
| * the License for the specific language governing permissions and limitations under the License. | ||
| */ | ||
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| package io.reactivex.internal.operators.mixed; | ||
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| import java.util.concurrent.atomic.AtomicReference; | ||
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| import org.reactivestreams.Subscription; | ||
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| import io.reactivex.*; | ||
| import io.reactivex.annotations.Experimental; | ||
| import io.reactivex.disposables.Disposable; | ||
| import io.reactivex.exceptions.Exceptions; | ||
| import io.reactivex.functions.Function; | ||
| import io.reactivex.internal.disposables.DisposableHelper; | ||
| import io.reactivex.internal.functions.ObjectHelper; | ||
| import io.reactivex.internal.subscriptions.SubscriptionHelper; | ||
| import io.reactivex.internal.util.*; | ||
| import io.reactivex.plugins.RxJavaPlugins; | ||
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| /** | ||
| * Maps the upstream values into {@link CompletableSource}s, subscribes to the newer one while | ||
| * disposing the subscription to the previous {@code CompletableSource}, thus keeping at most one | ||
| * active {@code CompletableSource} running. | ||
| * | ||
| * @param <T> the upstream value type | ||
| * @since 2.1.11 - experimental | ||
| */ | ||
| @Experimental | ||
| public final class FlowableSwitchMapCompletable<T> extends Completable { | ||
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| final Flowable<T> source; | ||
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| final Function<? super T, ? extends CompletableSource> mapper; | ||
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| final boolean delayErrors; | ||
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| public FlowableSwitchMapCompletable(Flowable<T> source, | ||
| Function<? super T, ? extends CompletableSource> mapper, boolean delayErrors) { | ||
| this.source = source; | ||
| this.mapper = mapper; | ||
| this.delayErrors = delayErrors; | ||
| } | ||
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| @Override | ||
| protected void subscribeActual(CompletableObserver s) { | ||
| source.subscribe(new SwitchMapCompletableObserver<T>(s, mapper, delayErrors)); | ||
| } | ||
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| static final class SwitchMapCompletableObserver<T> implements FlowableSubscriber<T>, Disposable { | ||
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| final CompletableObserver downstream; | ||
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| final Function<? super T, ? extends CompletableSource> mapper; | ||
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| final boolean delayErrors; | ||
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| final AtomicThrowable errors; | ||
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| final AtomicReference<SwitchMapInnerObserver> inner; | ||
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| static final SwitchMapInnerObserver INNER_DISPOSED = new SwitchMapInnerObserver(null); | ||
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| volatile boolean done; | ||
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| Subscription upstream; | ||
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| SwitchMapCompletableObserver(CompletableObserver downstream, | ||
| Function<? super T, ? extends CompletableSource> mapper, boolean delayErrors) { | ||
| this.downstream = downstream; | ||
| this.mapper = mapper; | ||
| this.delayErrors = delayErrors; | ||
| this.errors = new AtomicThrowable(); | ||
| this.inner = new AtomicReference<SwitchMapInnerObserver>(); | ||
| } | ||
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| @Override | ||
| public void onSubscribe(Subscription s) { | ||
| if (SubscriptionHelper.validate(upstream, s)) { | ||
| this.upstream = s; | ||
| downstream.onSubscribe(this); | ||
| s.request(Long.MAX_VALUE); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onNext(T t) { | ||
| CompletableSource c; | ||
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| try { | ||
| c = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null CompletableSource"); | ||
| } catch (Throwable ex) { | ||
| Exceptions.throwIfFatal(ex); | ||
| upstream.cancel(); | ||
| onError(ex); | ||
| return; | ||
| } | ||
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| SwitchMapInnerObserver o = new SwitchMapInnerObserver(this); | ||
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| for (;;) { | ||
| SwitchMapInnerObserver current = inner.get(); | ||
| if (current == INNER_DISPOSED) { | ||
| break; | ||
| } | ||
| if (inner.compareAndSet(current, o)) { | ||
| if (current != null) { | ||
| current.dispose(); | ||
| } | ||
| c.subscribe(o); | ||
| break; | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public void onError(Throwable t) { | ||
| if (errors.addThrowable(t)) { | ||
| if (delayErrors) { | ||
| onComplete(); | ||
| } else { | ||
| disposeInner(); | ||
| Throwable ex = errors.terminate(); | ||
| if (ex != ExceptionHelper.TERMINATED) { | ||
| downstream.onError(ex); | ||
| } | ||
| } | ||
| } else { | ||
| RxJavaPlugins.onError(t); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onComplete() { | ||
| done = true; | ||
| if (inner.get() == null) { | ||
| Throwable ex = errors.terminate(); | ||
| if (ex == null) { | ||
| downstream.onComplete(); | ||
| } else { | ||
| downstream.onError(ex); | ||
| } | ||
| } | ||
| } | ||
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| void disposeInner() { | ||
| SwitchMapInnerObserver o = inner.getAndSet(INNER_DISPOSED); | ||
| if (o != null && o != INNER_DISPOSED) { | ||
| o.dispose(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void dispose() { | ||
| upstream.cancel(); | ||
| disposeInner(); | ||
| } | ||
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| @Override | ||
| public boolean isDisposed() { | ||
| return inner.get() == INNER_DISPOSED; | ||
| } | ||
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| void innerError(SwitchMapInnerObserver sender, Throwable error) { | ||
| if (inner.compareAndSet(sender, null)) { | ||
| if (errors.addThrowable(error)) { | ||
| if (delayErrors) { | ||
| if (done) { | ||
| Throwable ex = errors.terminate(); | ||
| downstream.onError(ex); | ||
| } | ||
| } else { | ||
| dispose(); | ||
| Throwable ex = errors.terminate(); | ||
| if (ex != ExceptionHelper.TERMINATED) { | ||
| downstream.onError(ex); | ||
| } | ||
| } | ||
| return; | ||
| } | ||
| } | ||
| RxJavaPlugins.onError(error); | ||
| } | ||
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| void innerComplete(SwitchMapInnerObserver sender) { | ||
| if (inner.compareAndSet(sender, null)) { | ||
| if (done) { | ||
| Throwable ex = errors.terminate(); | ||
| if (ex == null) { | ||
| downstream.onComplete(); | ||
| } else { | ||
| downstream.onError(ex); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| static final class SwitchMapInnerObserver extends AtomicReference<Disposable> | ||
| implements CompletableObserver { | ||
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| private static final long serialVersionUID = -8003404460084760287L; | ||
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| final SwitchMapCompletableObserver<?> parent; | ||
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| SwitchMapInnerObserver(SwitchMapCompletableObserver<?> parent) { | ||
| this.parent = parent; | ||
| } | ||
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| @Override | ||
| public void onSubscribe(Disposable d) { | ||
| DisposableHelper.setOnce(this, d); | ||
| } | ||
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| @Override | ||
| public void onError(Throwable e) { | ||
| parent.innerError(this, e); | ||
| } | ||
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| @Override | ||
| public void onComplete() { | ||
| parent.innerComplete(this); | ||
| } | ||
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| void dispose() { | ||
| DisposableHelper.dispose(this); | ||
| } | ||
| } | ||
| } | ||
| } |
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